Lære Splitting, Trimming, and Replacing | Text Formatting & Manual Parsing

When working with text in C#, you often need to break it into parts, clean up unwanted spaces, or swap out words and characters. These tasks are essential for preparing data for analysis, user interfaces, or even simple display. Think about taking a sentence and splitting it into words, or processing a list of names separated by commas. You might also need to remove extra spaces from user input or replace certain words with others for consistency. These operations—splitting, trimming, and replacing—are the foundation of manual text parsing and cleaning.

Program.cs


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using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            string input = "  Alice, Bob ,  Charlie ,David  ";
            string[] names = input.Split(',');

            for (int i = 0; i < names.Length; i++)
            {
                names[i] = names[i].Trim();
            }

            Console.WriteLine("Names after splitting and trimming:");
            foreach (var name in names)
            {
                Console.WriteLine($"'{name}'");
            }
        }
    }
}

The Split method breaks a string into an array of substrings based on a delimiter, like a comma or space. After splitting, you often find that some parts have extra spaces at the beginning or end. The Trim method removes whitespace from both ends of a string, making each item clean and ready for use. Trimming is especially important when handling input from users or files, where extra spaces can cause bugs or incorrect processing.

Program.cs


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using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            string sentence = "The cat sat on the catmat.";
            string replaced = sentence.Replace("cat", "dog");
            Console.WriteLine(replaced);
        }
    }
}

The Replace method lets you swap out every occurrence of a word or character in a string with something else. Its syntax is straightforward: you call Replace on a string, passing in the text you want to change and the new text you want in its place. This is useful for correcting typos, standardizing terms, or removing unwanted symbols from your data.

Definition

Definition: Parsing is the process of analyzing a string of text and breaking it down into more useful parts, such as words, numbers, or tokens. Parsing is a key step in data processing, allowing you to extract and manipulate the information you need from raw text.


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string input = " value1 ; value2 ; value3 ";
string[] parts = input.Split(';');
for (int i = 0; i < parts.Length; i++)
{
    parts[i] = parts[i].Trim();
}

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Sektion 2. Kapitel 3

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Program.cs


              12345678910111213141516171819202122232425
            
using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            string input = "  Alice, Bob ,  Charlie ,David  ";
            string[] names = input.Split(',');

            for (int i = 0; i < names.Length; i++)
            {
                names[i] = names[i].Trim();
            }

            Console.WriteLine("Names after splitting and trimming:");
            foreach (var name in names)
            {
                Console.WriteLine($"'{name}'");
            }
        }
    }
}

Program.cs


              123456789101112131415
            
using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            string sentence = "The cat sat on the catmat.";
            string replaced = sentence.Replace("cat", "dog");
            Console.WriteLine(replaced);
        }
    }
}

Definition


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string input = " value1 ; value2 ; value3 ";
string[] parts = input.Split(';');
for (int i = 0; i < parts.Length; i++)
{
    parts[i] = parts[i].Trim();
}

Var alt klart?

Tak for dine kommentarer!

Sektion 2. Kapitel 3

Splitting, Trimming, and Replacing

1. What does the Split method return?

2. Which method removes whitespace from both ends of a string?

3. What is the result of Replace("apple", "orange") on the string "apple pie"?

Splitting, Trimming, and Replacing

1. What does the Split method return?

2. Which method removes whitespace from both ends of a string?

3. What is the result of Replace("apple", "orange") on the string "apple pie"?